<html>
    <body>
        <script>
        //18900053  左香菊
        //6
        var arr= [1, 2, 3];
        for (var i = 0 in arr) {
	        console.log(arr[i]);
        }


        //8
        "use strict"
        var m=n=2;
        console.log(m);


        //9
        "use strict"
        try{
            var m=n=2;
            console.log(n);
        }catch(e){
            console.log("出错啦");
        }

        </script>
    </body>
</html>